The true story of the Demon Core is terrifying: https://en.wikipedia.org/wiki/Demon_core#Second_incident
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RT @sashasoftshark
this tweet is destroying my notifications lmao so I'm gonna mute it but here's the thingiverse link if you wanna print one:

https://www.thingiverse.com/thing:4653109/files
https://twitter.com/sashasoftshark/status/1349423417381056512